A friend of mine on the summit of Ben Nevis one New Year's Day saw a naked guy standing on the trig point playing a trumpet. He told him he'd done it the previous two New Year's Days on the summits of Snowdon and Scafell Pike. It was apparently a bet for half a bottle of Pernod.
I've seen the photograph - superb. Don't know what the tune was, though. If he pointed the trumpet upwards, that would have been the highest note in Britain.
Cheers
Ray